1995 Chevy Tahoe No oil pressure indicated

Hello,

I recently changed the automatic transmission, and have not had oil pressure indicated since, although the engine runs fine and obviously actually DOES really have oil pressure.

Where is the oil pressure sensor located physically on this pre-vortec 5.7 V8 engine? I feel that it's only a wire disconnected, but so far I've not found the sending sensor. Of course, if the sensor has just coincidentally failed (unlikely) I'll still need to know where it is to replace it.

Regards,
Jim